/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3.tuple;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.util.Calendar;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import org.junit.Test;
/**
* Test the Pair class.
*
* @version $Id$
*/
public class PairTest {
@Test
public void testPairOf() throws Exception {
final Pair<Integer, String> pair = Pair.of(0, "foo");
assertTrue(pair instanceof ImmutablePair<?, ?>);
assertEquals(0, ((ImmutablePair<Integer, String>) pair).left.intValue());
assertEquals("foo", ((ImmutablePair<Integer, String>) pair).right);
final Pair<Object, String> pair2 = Pair.of(null, "bar");
assertTrue(pair2 instanceof ImmutablePair<?, ?>);
assertNull(((ImmutablePair<Object, String>) pair2).left);
assertEquals("bar", ((ImmutablePair<Object, String>) pair2).right);
}
@Test
public void testCompatibilityBetweenPairs() throws Exception {
final Pair<Integer, String> pair = ImmutablePair.of(0, "foo");
final Pair<Integer, String> pair2 = MutablePair.of(0, "foo");
assertEquals(pair, pair2);
assertEquals(pair.hashCode(), pair2.hashCode());
final HashSet<Pair<Integer, String>> set = new HashSet<Pair<Integer, String>>();
set.add(pair);
assertTrue(set.contains(pair2));
pair2.setValue("bar");
assertFalse(pair.equals(pair2));
assertFalse(pair.hashCode() == pair2.hashCode());
}
@Test
public void testMapEntry() throws Exception {
final Pair<Integer, String> pair = ImmutablePair.of(0, "foo");
final HashMap<Integer, String> map = new HashMap<Integer, String>();
map.put(0, "foo");
final Entry<Integer, String> entry = map.entrySet().iterator().next();
assertEquals(pair, entry);
assertEquals(pair.hashCode(), entry.hashCode());
}
@Test
public void testComparable1() throws Exception {
final Pair<String, String> pair1 = Pair.of("A", "D");
final Pair<String, String> pair2 = Pair.of("B", "C");
assertTrue(pair1.compareTo(pair1) == 0);
assertTrue(pair1.compareTo(pair2) < 0);
assertTrue(pair2.compareTo(pair2) == 0);
assertTrue(pair2.compareTo(pair1) > 0);
}
@Test
public void testComparable2() throws Exception {
final Pair<String, String> pair1 = Pair.of("A", "C");
final Pair<String, String> pair2 = Pair.of("A", "D");
assertTrue(pair1.compareTo(pair1) == 0);
assertTrue(pair1.compareTo(pair2) < 0);
assertTrue(pair2.compareTo(pair2) == 0);
assertTrue(pair2.compareTo(pair1) > 0);
}
@Test
public void testToString() throws Exception {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals("(Key,Value)", pair.toString());
}
@Test
public void testToStringCustom() throws Exception {
final Calendar date = Calendar.getInstance();
date.set(2011, Calendar.APRIL, 25);
final Pair<String, Calendar> pair = Pair.of("DOB", date);
assertEquals("Test created on " + "04-25-2011", pair.toString("Test created on %2$tm-%2$td-%2$tY"));
}
@Test
public void testFormattable_simple() throws Exception {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals("(Key,Value)", String.format("%1$s", pair));
}
@Test
public void testFormattable_padded() throws Exception {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals(" (Key,Value)", String.format("%1$20s", pair));
}
}